Sign up to receive free email alerts when patent applications with chosen keywords are publishedSIGN UP

Abstract:

The present invention provides a flat panel display device, which
includes a backlight system and a display panel, wherein the backlight
system includes a light source, a light homogenization mechanism, and a
back frame; the back frame carries the light source and the light
homogenization mechanism, the light homogenization mechanism guiding
light from the light source to a light incidence surface of the display
panel; the back frame includes at least two primary assembling pieces,
the at least two primary assembling pieces having joint sections and the
at least two primary assembling pieces being joined through the
corresponding joint sections to form a main frame structure of back
frame; and the joint sections of the at least two primary assembling
pieces are provided with mating foolproof structures. The present
invention also provides a stereoscopic display device and a plasma
display device. The stereoscopic display device and the plasma display
device of the present invention have a simple structure and can reduce
the expenditure of the back frame mold, and can also save the material
used for back frame so as to lower down the manufacturing cost, and also
satisfy a foolproof design to thereby reduce operation errors and
increase manufacturing efficiency.

Claims:

1. A flat panel display device, wherein the flat panel display device
comprises a backlight system and a display panel, wherein: the backlight
system comprises a light source, a light homogenization mechanism, and a
back frame; the back frame carries the light source and the light
homogenization mechanism, the light homogenization mechanism guiding
light from the light source to a light incidence surface of the display
panel; the back frame comprises at least two primary assembling pieces,
the at least two primary assembling pieces comprising joint sections, the
at least two primary assembling pieces being joined through the
corresponding joint sections; and the joint sections of the at least two
primary assembling pieces are provided with mating foolproof structures.

2. The flat panel display device as claimed in claim 1, wherein: the back
frame comprises at least first and second primary assembling pieces, the
joint section of the assembling piece having a non-axial symmetric
structure.

3. The flat panel display device as claimed in claim 2, wherein: the
joint section of the first primary assembling piece forms a recess and
the recess has a chamfer, the second primary assembling piece having an
end serving as a joint section that comprises another chamfer mating said
chamfer, said chamfer and said another chamfer mating each other to form
the foolproof structure.

5. The flat panel display device as claimed in claim 1, wherein: the back
frame comprises at least first and second primary assembling pieces, the
first and second primary assembling pieces having joint sections, the
joint section of the first primary assembling piece having a bottom
forming a projection and the second primary assembling piece having a
bottom forming a recess mating the projection, the projection being fit
into the recess to form the foolproof structure.

6. The flat panel display device as claimed in claim 5, wherein: the
projection comprises a rectangular projection, a circular projection, a
trapezoidal projection, or a conic projection.

7. The flat panel display device as claimed in claim 5, wherein: the
projection is formed on a side surface or a bottom surface of the joint
section of the first primary assembling piece.

8. The flat panel display device as claimed in claim 1, wherein: the back
frame comprises at least first and second primary assembling pieces,
wherein the first primary assembling piece has an end forming at least
two joint sections each having a structure mating a corresponding end of
the second primary assembling piece, the first primary assembling piece
using one of the joint sections thereof to join the corresponding end of
the second primary assembling piece, the at least two joint sections
being arranged to space from each other in a lengthwise direction of the
first primary assembling piece.

9. The flat panel display device as claimed in claim 8, wherein: the
joint sections comprise recesses formed in the surface of the first
primary assembling piece, the second primary assembling piece having an
end having a surface forming at least two protrusions that are arranged
to space from each other in a lengthwise direction of the second primary
assembling piece, the protrusions being receivable in the recesses to
join the first primary assembling piece and the second primary assembling
piece to each other.

10. The flat panel display device as claimed claim 9, wherein: the recess
of the first primary assembling piece forms in a bottom thereof a first
through hole, the second primary assembling piece forming in a
corresponding location a second through hole, the back frame comprising a
fastener, the fastener extending through the first through hole and the
second through hole to join the first primary assembling piece and the
second primary assembling piece to each other.

11. The flat panel display device as claimed in claim 9, wherein: the
back frame comprises a third primary assembling piece and a fourth
primary assembling piece; and the first primary assembling piece, the
second primary assembling piece, the third primary assembling piece, and
the fourth primary assembling piece are connected to each other to form a
main frame structure of the back frame.

12. The flat panel display device as claimed in claim 11, wherein: the
back frame comprises secondary assembling pieces arranged in the main
frame structure, the secondary assembling pieces being joined to the main
frame structure; and the secondary assembling pieces comprise a first
secondary assembling piece and a second secondary assembling piece, the
first secondary assembling piece having two ends respectively joined to
at least two primary assembling pieces of the first primary assembling
piece, the second primary assembling piece, the third primary assembling
piece, and the fourth primary assembling piece, the second secondary
assembling piece having two ends respectively joined to at least two
primary assembling pieces of the first primary assembling piece, the
second primary assembling piece, the third primary assembling piece, and
the fourth primary assembling piece.

13. The flat panel display device as claimed in claim 12, wherein: the
two ends of the first secondary assembling piece are respectively joined
to the first primary assembling piece and the second primary assembling
piece that are adjacent to each other and the two ends of the second
secondary assembling piece are respectively joined to the third primary
assembling piece and the fourth primary assembling piece that are
adjacent to each other; or the two ends of the first secondary assembling
piece are respectively joined to the first primary assembling piece and
the third primary assembling piece that are opposite to each other and
the two ends of the second secondary assembling piece are respectively
joined to the first primary assembling piece and the third primary
assembling piece that are opposite to each other, the second primary
assembling piece, the fourth primary assembling piece, the first
secondary assembling piece, and the second secondary assembling piece
being arranged parallel to each other.

14. The flat panel display device as claimed in claim 13, wherein: the
back frame comprises at least one bracing piece, which is releasably
fixed to one or more of the first primary assembling piece, the second
primary assembling piece, the third primary assembling piece, the fourth
primary assembling piece, the first secondary assembling piece, and the
second secondary assembling piece, the bracing piece forming a bump.

15. A stereoscopic display device, wherein: the stereoscopic display
device comprises a liquid crystal lens grating, a backlight system, and a
display panel, the liquid crystal lens grating being arranged on a light
exit surface of the display panel; the backlight system comprises a light
source, a light homogenization mechanism, and a back frame; the back
frame carries the light source and the light homogenization mechanism,
the light homogenization mechanism guiding light from the light source to
a light incidence surface of the display panel; the back frame comprises
at least two primary assembling pieces, the at least two primary
assembling pieces comprising joint sections, the at least two primary
assembling pieces being joined through the corresponding joint sections;
and the joint sections of the at least two primary assembling pieces are
provided with mating foolproof structures.

16. A plasma display device, wherein: the plasma display device comprises
a plasma display panel and a back frame, the back frame being arranged at
a back side of the plasma display panel; the back frame comprises at
least two primary assembling pieces, the at least two primary assembling
pieces comprising joint sections, the at least two primary assembling
pieces being joined through the corresponding joint sections; and the
joint sections of the at least two primary assembling pieces are provided
with mating foolproof structures.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to the field of displaying
techniques, and in particular to a flat panel display device, a
stereoscopic display device, and a plasma display device.

[0003] 2. The Related Arts

[0004] The state-of-the-art liquid crystal display device comprises a
front bezel, a panel, and a backlight module, of which the backlight
module comprises a back frame, a reflector plate, a light guide, and a
lighting assembly.

[0005] Currently, a variety of display panels of different sizes are
available in the market to meet different needs of general consumers. For
example, in the field of television set, the sizes of liquid crystal
panels include 31.5, 42, 46, 48, and 55 inches. Different back frame
molds are provided for liquid crystal planes of different sizes.

[0006] Referring to FIG. 1, FIG. 1 is a schematic view showing a
conventional back frame of liquid crystal display device. As shown in
FIG. 1, the conventional back frame 10 is a unitary back frame, and it is
often that a unitary back frame 10 is made with metal stamping or plastic
injection molding. The unitary back frame 10 consumes much material and
has a high material cost. Further, a large-sized back frame 10 requires
large-sized stamping equipment, and the size of mold corresponding to
such a back frame 10 is large and the structure complicated, making the
expenditure of the back frame mold high. As a consequence, the
conventional back frame is of a high cost.

SUMMARY OF THE INVENTION

[0007] The technical issue to be addressed by the present invention is to
provide a flat panel display device, a stereoscopic display device, and a
plasma display device, which help lowering the material cost and mold
cost and also reduce operation errors and increase manufacturing
efficiency.

[0008] To address the above technical issue, the present invention adopts
a technical solution that provides a flat panel display device, the flat
panel display device comprising a backlight system and a display panel,
wherein: the backlight system comprises a light source, a light
homogenization mechanism, and a back frame; the back frame carries the
light source and the light homogenization mechanism, the light
homogenization mechanism guiding light from the light source to a light
incidence surface of the display panel; the back frame comprises at least
two primary assembling pieces, the at least two primary assembling pieces
comprising joint sections, the at least two primary assembling pieces
being joined through the corresponding joint sections to form a main
frame structure of the back frame; the joint sections of the at least two
primary assembling pieces are provided with mating foolproof structures.

[0009] Wherein, the back frame comprises at least first and second primary
assembling pieces, the joint section of the assembling piece having a
non-axial symmetric structure.

[0010] Wherein, the joint section of the first primary assembling piece
forms a recess and the recess has a chamfer, the second primary
assembling piece having an end serving as a joint section that comprises
another chamfer mating said chamfer, said chamfer and said another mating
each other to form the foolproof structure.

[0012] Wherein, the back frame comprises at least first and second primary
assembling pieces, the first and second primary assembling pieces having
joint sections, the joint section of the first primary assembling piece
having a bottom forming a projection and the second primary assembling
piece having a bottom forming a recess mating the projection, the
projection being fit into the recess to form the foolproof structure.

[0013] Wherein, the projection comprises a rectangular projection, a
circular projection, a trapezoidal projection, or a conic projection.

[0014] Wherein, the projection is formed on a side surface or a bottom
surface of the joint section of the first primary assembling piece.

[0015] Wherein, the back frame comprises at least first and second primary
assembling pieces, wherein the first primary assembling piece has an end
forming at least two joint sections each having a structure mating a
corresponding end of the second primary assembling piece, the first
primary assembling piece using one of the joint sections thereof to join
the corresponding end of the second primary assembling piece, the at
least two joint sections being arranged to space from each other in a
lengthwise direction of the first primary assembling piece.

[0016] Wherein, the joint sections comprise recesses formed in the surface
of the first primary assembling piece, the second primary assembling
piece having an end having a surface forming at least two protrusions
that are arranged to space from each other in a lengthwise direction of
the second primary assembling piece, the protrusions being receivable in
the recesses to join the first primary assembling piece and the second
primary assembling piece to each other.

[0017] Wherein, the recess of the first primary assembling piece forms in
a bottom thereof a first through hole, the second primary assembling
piece forming in a corresponding location a second through hole, the back
frame comprising a fastener, the fastener extending through the first
through hole and the second through hole to join the first primary
assembling piece and the second primary assembling piece to each other.

[0018] Wherein, the back frame comprises a third primary assembling piece
and a fourth primary assembling piece; and the first primary assembling
piece, the second primary assembling piece, the third primary assembling
piece, and the fourth primary assembling piece are connected to each
other to form a main frame structure of the back frame.

[0019] Wherein, the back frame comprises secondary assembling pieces
arranged in the main frame structure, the secondary assembling pieces
being joined to the main frame structure, the secondary assembling pieces
comprising a first secondary assembling piece and a second secondary
assembling piece, the first secondary assembling piece having two ends
respectively joined to at least two primary assembling pieces of the
first primary assembling piece, the second primary assembling piece, the
third primary assembling piece, and the fourth primary assembling piece,
the second secondary assembling piece having two ends respectively joined
to at least two primary assembling pieces of the first primary assembling
piece, the second primary assembling piece, the third primary assembling
piece, and the fourth primary assembling piece.

[0020] Wherein, the two ends of the first secondary assembling piece are
respectively joined to the first primary assembling piece and the second
primary assembling piece that are adjacent to each other and the two ends
of the second secondary assembling piece are respectively joined to the
third primary assembling piece and the fourth primary assembling piece
that are adjacent to each other; or the two ends of the first secondary
assembling piece are respectively joined to the first primary assembling
piece and the third primary assembling piece that are opposite to each
other and the two ends of the second secondary assembling piece are
respectively joined to the first primary assembling piece and the third
primary assembling piece that are opposite to each other, the second
primary assembling piece, the fourth primary assembling piece, the first
secondary assembling piece, and the second secondary assembling piece
being arranged parallel to each other.

[0021] Wherein, the back frame comprises at least one bracing piece, which
is releasably fixed to one or more of the first primary assembling piece,
the second primary assembling piece, the third primary assembling piece,
the fourth primary assembling piece, the first secondary assembling
piece, and the second secondary assembling piece, the bracing piece
forming a bump.

[0022] To address the above technical issue, the present invention adopts
a technical solution that provides a stereoscopic display device, which
comprises a liquid crystal lens grating, a backlight system, and a
display panel, the liquid crystal lens grating being arranged on a light
exit surface of the display panel; the backlight system comprises a light
source, a light homogenization mechanism, and a back frame; the back
frame carries the light source and the light homogenization mechanism,
the light homogenization mechanism guiding light from the light source to
a light incidence surface of the display panel; the back frame comprises
at least two primary assembling pieces, the at least two primary
assembling pieces comprising joint sections, the at least two primary
assembling pieces being joined through the corresponding joint sections;
the joint sections of the at least two primary assembling pieces are
provided with mating foolproof structures.

[0023] To address the above technical issue, the present invention adopts
a technical solution that provides a plasma display device, which
comprises a plasma display panel and a back frame, the back frame being
arranged at a back side of the plasma display panel;

[0024] the back frame comprises at least two primary assembling pieces,
the at least two primary assembling pieces comprising joint sections, the
at least two primary assembling pieces being joined through the
corresponding joint sections; and

[0025] the joint sections of the at least two primary assembling pieces
are provided with mating foolproof structures.

[0026] The efficacy of the present invention is that to be distinguished
from the state of the art, the present invention provides a flat panel
display device, a stereoscopic display device, and a plasma display
device that comprise at least two primary assembling pieces, of which the
first primary assembling piece forms at least two joint sections, the
first primary assembling piece using one of the joint sections to join a
corresponding end of the second primary assembling piece so as to make a
back frame mold simple in structure, reduce the cost of back frame mold,
save material used for back frame, and lowers down the manufacturing cost
of flat panel display device. Through forming mating foolproof structures
on the joint sections of the primary assembling pieces, it satisfies a
foolproof design to help an operator to easily assemble a back frame
without making mistakes, reduce operation errors and increase efficiency.

[0035] FIG. 9 is a schematic view showing a back frame of a flat panel
display device according to a third embodiment of the present invention;

[0036] FIG. 10 is a schematic view showing a back frame of a flat panel
display device according to a fourth embodiment of the present invention;

[0037] FIG. 11 is a schematic view showing a joining structure of a flat
panel display device according to a fifth embodiment of the present
invention;

[0038] FIG. 12 is a schematic view showing a diagonally-arranged first
secondary assembling piece mounted to a main frame structure of a flat
panel display device according to a sixth embodiment of the present
invention;

[0039] FIG. 13 is a schematic view showing a first secondary assembling
piece and a second secondary assembling piece mounted to a main frame
structure of a flat panel display device according to a seventh
embodiment of the present invention;

[0040] FIG. 14 is a schematic view showing joint sections of a back frame
of a flat panel display device according to an eighth embodiment of the
present invention;

[0041] FIG. 15 is a cross-sectional view showing a first example of joint
section of FIG. 9;

[0042] FIG. 16 is a schematic view showing a joining structure of a joint
section of a back frame of a flat panel display device according to a
ninth embodiment of the present invention;

[0043] FIG. 17 is a schematic view showing a joining structure of a joint
section of a back frame of a flat panel display device according to a
tenth embodiment of the present invention;

[0044] FIG. 18 is a schematic view showing a joining structure of a joint
section of a back frame of a flat panel display device according to an
eleventh embodiment of the present invention;

[0045] FIG. 19 is a schematic view showing a joint section of a back frame
of a flat panel display device according to a twelfth embodiment of the
present invention;

[0046] FIG. 20 is a schematic view showing a joint section of a back frame
of a flat panel display device according to a thirteenth embodiment of
the present invention;

[0047] FIG. 21 is a flow chart showing a method for manufacturing a back
frame of a flat panel display device according to a fourteenth embodiment
of the present invention;

[0048] FIG. 22 is a schematic view showing a flat panel display device
with a touch screen according to a fifteenth embodiment of the present
invention;

[0049] FIG. 23 is a schematic view showing a stereoscopic display device
according to a sixteenth embodiment of the present invention; and

[0050] FIG. 24 is a schematic view showing a plasma display device
according to a seventeenth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] Referring to FIGS. 2-3, FIG. 2 is a schematic view showing a flat
panel display device according to a first embodiment of the present
invention and FIG. 3 is a schematic view showing a back frame of a flat
panel display device according to a second embodiment of the present
invention. As shown in FIG. 2, the flat panel display device 20 according
to the instant embodiment comprises: a backlight system 21 and a display
panel 22. The backlight system 21 is arranged on a back side of the
display panel 22 and supplies light to the display panel 22.

[0052] In the instant embodiment, the backlight system 21 comprises a
light source 25, a light homogenization mechanism 24, and a back frame
23. The back frame 23 carries the light source 25 and the light
homogenization mechanism 24. When the backlight system 21 is an edge
lighting type, the light homogenization mechanism 24 is a light guide;
and when the backlight system 21 is a direct type, the light
homogenization mechanism 24 is a diffuser plate. The back frame 23
comprises at least a first primary assembling piece and a second primary
assembling piece, and the at least a first and a second primary
assembling pieces constitute a main frame structure 27 of the back frame
23.

[0053] Referring also to FIG. 3, the back frame 23 of the first embodiment
comprises a first primary assembling piece 261 and a second primary
assembling piece 262. The first primary assembling piece 261 has an end
joined to an end of the second primary assembling piece 262, and the
first primary assembling piece 261 has another end joined to another end
of the second primary assembling piece 262 in order to form the main
frame structure 27 of the back frame 23. The first primary assembling
piece 261 and the second primary assembling piece 262 are both aluminum
pieces or galvanized steel pieces. In the instant embodiment, the first
primary assembling piece 261 and the second primary assembling piece 262
are L-shaped.

[0054] Further referring to FIG. 3, in the instant embodiment, there are
at least two primary assembling pieces, namely the first primary
assembling piece 261 comprising a joint section 2611 and the second
primary assembling piece 262 comprising a joint section 2621. The joint
sections of the first primary assembling piece 261 and the second primary
assembling piece 262 are respectively provided with mating foolproof
structure.

[0055] The joint section 2611 and the joint section 2621 are taken as an
example for description as follows.

[0056] Referring to FIGS. 4-8, FIGS. 4-8 are exploded views showing
various embodiments of the joint sections shown in FIG. 3. When the joint
section 2611 and the joint section 2621 are designed as non-axially
symmetric patterns, the need for foolproofing is satisfied. Specifically,
as shown in FIG. 4, the joint section 2611 forms a recess and the recess
has a chamfer to make it non-axially symmetric. Correspondingly, the
joint section 2621 is an end of the second primary assembling piece 262.
The joint section 2621 forms a chamfer that mates the chamfer of the
joint section 2611 at a corresponding location. The two chamfers
collectively form a foolproof structure. The chamfers can be triangle
chamfers (as shown in FIG. 4), or the chamfers can be rectangular
chamfers, circular chamfers, or serrated chamfers. Certainly, the shape,
size, number, and position of the chamfer are generally dependent upon
the design requirements, provided they allow an operator to easily
assemble a back frame with no mistakes. No undue limitations will be
imposed.

[0057] Certainly, when the joint section 2611 and the joint section 2621
are designed as axially symmetric, the joint section 2611 can be provided
with a projection, while the joint section 2621 that mates it is provided
at a corresponding position a recess, so that the projection and the
recess collectively form a foolproof structure (as shown in FIG. 5). In
addition to a projection, the joint section 2611 can also be provided
with a recess, while, correspondingly, the joint section 2621 is provided
with a recess and a projection, whereby only when the projection of the
joint section 2611 is fit into the recess of the joint section 2621 and
the projection of the joint section 2621 is fit into the projection of
the joint section 2611, joining of the joint sections can be realized. In
the instant embodiment, the recesses can be replaced by through holes and
the mating projections can be fit into the through holes to form a
foolproof structure.

[0058] Referring to FIG. 6, the joint section 2611 comprises an elongate
slot and a plurality of circular recesses and the joint section 2621
comprises an elongate projection that mates the elongate slot of the
joint section 2611 and a plurality of circular projections mating the
circular recesses. It is only when the elongate projection is completely
fit into the elongate slot and the circular projections completely fit
into the circular recesses that the joining between the joint section
2611 and the joint section 2621 can be realized. This provides a
foolproof design for frame and also realizes positioning.

[0059] Referring to FIG. 7, the joint section 2611 comprises an elongate
slot and a plurality of rectangular recesses and the joint section 2621
comprises an elongate projection that mates the elongate slot of the
joint section 2611 and a plurality of rectangular projections mating the
rectangular recesses. It is only when the elongate projection is
completely fit into the elongate slot and the rectangular projections
completely fit into the rectangular recesses that the joining between the
joint section 2611 and the joint section 2621 can be realized. This
provides a foolproof design for frame and also realizes positioning.

[0060] With such structures, an operator may easily and correctly assemble
a back frame. The projection can be a rectangular projection, a circular
projection, a trapezoidal projection, or a conic projection. The
projection can be arranged on a side surface or a bottom surface of a
joint section.

[0061] It is noted that the shape of the projection is not limited to the
above embodiments and the number, size, and position of the projection
can be set according to practical applications, provided that the mating
recesses can be stacked therewith in a concave-convex stacking manner. No
limitation is imposed herein.

[0062] Referring to FIG. 8, the joint section 2611 comprises an elongate
slot and elongate projections formed on opposite sides of the elongate
projection and the joint section 2621 is correspondingly provided with an
elongate projection that mates the elongate slot of the joint section
2611 and a plurality of elongate recesses mating the elongate
projections. It is only when the elongate projections are completely fit
into the elongate slots that the joining between the joint section 2611
and the joint section 2621 can be realized. This provides a foolproof
design for frame and also realizes positioning.

[0063] The embodiments of the present invention employ a joining operation
to form a back frame in order to simplify the structure of the back frame
and save the material used for the back frame so as to reduce the
manufacturing cost of a backlight display device. Further, joining is
carried out with the joint sections of the first primary assembling piece
261 and the second primary assembling piece 262 being provided with
mating foolproof structure, so as to satisfy foolproof design and help an
operator to easily assemble a back frame without making mistakes and thus
reducing operation errors and improving efficiency.

[0064] It is noted all the embodiments described above that comprise
mating foolproof structure are also applicable to various embodiments of
back frame, backlight system, and flat panel display device that will be
described.

[0065] Referring also to FIG. 9, the back frame 23 of a third embodiment
comprises a first primary assembling piece 281, a second primary
assembling piece 282, and a third primary assembling piece 283. The three
primary assembling pieces 281, 282, and 283 are assembled and joined to
form a main frame structure 27 of the back frame 23. The three primary
assembling pieces 281, 282, and 283 are all aluminum pieces or galvanized
steel pieces. In the instant embodiment, the first primary assembling
piece 281 is L-shaped, and the second and third primary assembling pieces
282, 283 are straight linear.

[0066] Further, the back frame 23 further comprises secondary assembling
pieces arranged inside and joined to the main frame structure 27.

[0067] A detailed description will be given to the back frame 23 of the
flat panel display device 20 according to the present invention, which
comprises four primary assembling pieces and two secondary assembling
pieces.

[0068] Referring to FIG. 10, FIG. 10 is a schematic view showing a back
frame of flat panel display device according to a fourth embodiment of
the present invention. As shown in FIG. 10, in the instant embodiment, a
back frame 23 comprises: a first primary assembling piece 231, a second
primary assembling piece 232, a third primary assembling piece 233, a
fourth primary assembling piece 234, a first secondary assembling piece
235, a second secondary assembling piece 236, and bracing pieces 2371,
2372, 2373, 2374, 2375, 2376, and 2377. The first primary assembling
piece 231, the second primary assembling piece 232, the third primary
assembling piece 233, and the fourth primary assembling piece 234 are
joined to each other in a leading end-to-tailing end manner to constitute
a main frame structure 27 of the back frame 23. The first secondary
assembling piece 235 and the second secondary assembling piece 236,
serving as ancillary assembling pieces, are arranged in the main frame
structure 27 and joined to the main frame structure 27.

[0069] Specifically, an end of the first primary assembling piece 231 is
joined to an end of the second primary assembling piece 232, another end
of the second primary assembling piece 232 is joined to an end of the
third primary assembling piece 233, another end of the third primary
assembling piece 233 is joined to an end of the fourth primary assembling
piece 234, and another end of the fourth primary assembling piece 234 is
joined to another end of the first primary assembling piece 231 in order
to form the rectangular main frame structure 27. The first primary
assembling piece 231, the second primary assembling piece 232, the third
primary assembling piece 233, and the fourth primary assembling piece 234
are all aluminum pieces or galvanized steel pieces. In the instant
embodiment, the first primary assembling piece 231, the second primary
assembling piece 232, the third primary assembling piece 233, and the
fourth primary assembling piece 234 are straight linear, yet in other
embodiments, it is apparent to those skilled in the art to make all the
first primary assembling piece 231, the second primary assembling piece
232, the third primary assembling piece 233, and the fourth primary
assembling piece 234 L-shaped, or some being straight linear and the
remaining being L-shaped. For example, in FIG. 3, the first primary
assembling piece 261 and the second primary assembling piece 262 are both
L-shaped; in FIG. 9, the first primary assembling piece 281 is L-shaped,
while the second and third primary assembling pieces 282 and 283 are
straight linear.

[0070] Referring to FIG. 11, FIG. 11 is a schematic view showing a joining
structure of a flat panel display device according to a fifth embodiment
of the present invention. In the instant embodiment, the back frame 23 of
the flat panel display device 20 is formed by joining connection. As
shown in FIG. 11, an illustrative example is given for the connection of
an end of the first primary assembling piece 231 to an end of the second
primary assembling piece 232, wherein the end of the second primary
assembling piece 232 is joined to the end of the first primary assembling
piece 231 by means of for example screwing, fastening, or welding, to
have the end of the second primary assembling piece 232 connected to the
end of the first primary assembling piece 231.

[0071] Referring to FIG. 12, FIG. 12 is a schematic view showing a
diagonally-arranged first secondary assembling piece mounted to a main
frame structure of a flat panel display device according to a sixth
embodiment of the present invention. In the instant embodiment, the first
secondary assembling piece 235 and the second secondary assembling piece
236 are arranged in the main frame structure 27 of the back frame 23. An
end of the first secondary assembling piece 235 is joined to the first
primary assembling piece 231 and another end of the first secondary
assembling piece 235 is joined to the third primary assembling piece 233;
and an end of the second secondary assembling piece 236 is joined to the
first primary assembling piece 231 and another end of the second
secondary assembling piece 236 is joined to the third primary assembling
piece 233. Further, the second primary assembling piece 232, the fourth
primary assembling piece 234, the first secondary assembling piece 235,
and the second secondary assembling piece 236 are arranged parallel to
each other. In other embodiments, those skilled in the art may arrange at
least one secondary assembling piece in the main frame structure 27. For
example, only the first secondary assembling piece 235 is arranged in the
main frame structure 27. Further, the two ends of the first secondary
assembling piece 235 can be selectively joined to at least two of the
primary assembling pieces of the first primary assembling piece 231, the
second primary assembling piece 232, the third primary assembling piece
233, and the fourth primary assembling piece 234. For example, the first
secondary assembling piece 235 is set diagonally in the main frame
structure 27, as shown in FIG. 12. Similarly, the two ends of the second
secondary assembling piece 236 can be selectively joined to at least two
of the primary assembling pieces of the first primary assembling piece
231, the second primary assembling piece 232, the third primary
assembling piece 233, and the fourth primary assembling piece 234.

[0072] Referring to FIG. 13, FIG. 13 is a schematic view showing a first
secondary assembling piece and a second secondary assembling piece
mounted to a main frame structure of a flat panel display device
according to a seventh embodiment of the present invention. For example,
the two ends of the first secondary assembling piece 235 are respectively
joined to the first primary assembling piece 231 and the second primary
assembling piece 232 that are adjacent to each other and the two ends of
the second secondary assembling piece 236 are respectively joined the
third primary assembling piece 233 and the fourth primary assembling
piece 234 that are adjacent to each other.

[0073] Collectively referring to FIGS. 9-13, in the above embodiments, the
back frame 23 comprises seven bracing pieces 2371, 2372, 2373, 2374,
2375, 2376, and 2377. The bracing piece 2371 is fixed to the fourth
primary assembling piece 234; the bracing pieces 2372, 2373 are both
fixed to the first secondary assembling piece 235; the bracing piece 2374
is fixed to the second secondary assembling piece 236; the bracing piece
2375 is fixed to the second primary assembling piece 232; and the bracing
pieces 2376, 2377 are each fixed, at two ends thereof, to the first
secondary assembling piece 235 and the second secondary assembling piece
236. In practice, the bracing pieces can be fixed to one or more of the
first primary assembling piece 231, the second primary assembling piece
232, the third primary assembling piece 233, the fourth primary
assembling piece 234, the first secondary assembling piece 235, and the
second secondary assembling piece 236. In other embodiments, those
skilled in the art may mount bracing pieces of any other numbers to the
back frame 23, such as one or more bracing pieces. Further, the bracing
pieces can be releasably fixed to one or more of the first primary
assembling piece 231, the second primary assembling piece 232, the third
primary assembling piece 233, the fourth primary assembling piece 234,
the first secondary assembling piece 235, and the second secondary
assembling piece 236.

[0074] The bracing pieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377 may
be provided with bumps (not labeled) so that the back frame 23 may fix
components, such as circuit boards, with such bumps.

[0075] Molds for making the back frame 23 will be described. In the
instant embodiment, the first primary assembling piece 231 and the third
primary assembling piece 233 are of the same size and shape so that they
can be made by stamping with the same mold. The second primary assembling
piece 232, the fourth primary assembling piece 234, the first secondary
assembling piece 235, and the second secondary assembling piece 236 are
of the same size and shape so that they can be made by stamping with the
same mold, making it possible to share the mold. Thus, the back frame 23
of the present invention can be made by stamping with only two
small-sized molds, and compared to the conventional back frame 10 that
requires a large-sized mold, the molds for making the back frame 23 of
the present invention are simple in structure and small in size and thus
the cost of mold for the back frame 23 can be lowered. Further, compared
to the whole back frame structure of the conventional back frame 10, the
back frame 23 of the present invention can significantly save material
used and thus reduce the manufacturing cost of the flat panel display
device 20.

[0076] Referring to FIG. 14, FIG. 14 is a schematic view showing joint
sections of a back frame of a flat panel display device according to an
eighth embodiment of the present invention. As shown in FIG. 14, in the
instant embodiment, an end of the first primary assembling piece is
provided with two joint sections, and the joint sections have a structure
mating an end of the second primary assembling piece so that the first
primary assembling piece can be joined to a corresponding end of the
second primary assembling piece.

[0077] Specifically, the first primary assembling piece 231 has an end
having a surface forming joint sections 2311, 2312, and the joint
sections 2311, 2312 are arranged in a spaced manner in a lengthwise
direction of the first primary assembling piece 231. The joint sections
2311, 2312 are formed by forming recesses having a shape mating an end of
the second primary assembling piece 232 in the first primary assembling
piece 231 in order to receive the end of the second primary assembling
piece 232 therein.

[0078] Referring to FIG. 15, FIG. 15 is a schematic view showing a first
secondary assembling piece and a second secondary assembling piece
mounted to a main frame structure of a flat panel display device
according to a seventh embodiment of the present invention. As shown in
FIG. 15, the joint sections 2311, 2312 are recesses that do not extend
through opposite surfaces of the end of the first primary assembling
piece 231 and the recesses are of a rectangular shape with the second
primary assembling piece 232 being straight linear.

[0079] To assemble a large-sized back frame 23, the joint section 2311
that is close to the very end of the first primary assembling piece 231
is first taken and a second primary assembling piece 232 having a
corresponding width is selected. Afterwards, an end of the second primary
assembling piece 232 is positioned in the recess of the joint section
2311. And then, means, such as screwing, fastening, or welding, is
applied to join and fix the end of the second primary assembling piece
232 to the joint section 2311. To assemble a small-sized back frame 23,
the joint section 2312 that is distant from the very end of the first
primary assembling piece 231 is first chosen and a second primary
assembling piece 232 having a corresponding width is selected.
Afterwards, an end of the second primary assembling piece 232 is
positioned in the recess of the joint section 2312. And then, means, such
as screwing, fastening, or welding, is applied to join and fix the end of
the second primary assembling piece 232 to the joint section 2312.

[0080] Referring to FIG. 16, FIG. 16 is a schematic view showing a joining
structure of a joint section of a back frame of a flat panel display
device according to a ninth embodiment of the present invention. As shown
in FIG. 16, to allow of selection of the size of the back frame 23 in
another direction, for example the second primary assembling piece 232
forms a protrusion at a corresponding location on a surface thereof, and
the protrusion of the second primary assembling piece 232 is embedded in
the recess of the first primary assembling piece 231 at a corresponding
location in order to join the first primary assembling piece 231 and the
second primary assembling piece 232. Further, the second primary
assembling piece 232 may form, on one end thereof, at least two
protrusions that are spaced in the lengthwise direction of the second
primary assembling piece 232, such as two, three, or four protrusions.

[0081] Furthermore, as shown in FIG. 17, FIG. 17 is a schematic view
showing a joining structure of a joint section of a back frame of a flat
panel display device according to a tenth embodiment of the present
invention. The recess of the first primary assembling piece 231 can be a
recess of a multi-stepped configuration and the second primary assembling
piece 232 forms, at a corresponding location, a protrusion having a
multi-stepped configuration corresponding to the recess, as shown in FIG.
12.

[0082] Further, as shown in FIG. 18, FIG. 18 is a schematic view showing a
joining structure of a joint section of a back frame of a flat panel
display device according to an eleventh embodiment of the present
invention. Taking the joint section 2311 as an example, the recess of the
first primary assembling piece 231 forms, in a bottom thereof, a first
through hole 2313, and the second primary assembling piece 232 forms, at
a location corresponding to the joint section 2311, a second through hole
2321. The back frame 23 further comprises a fastener 240. The fastener
240 extends through the first through hole 2313 and the second through
hole 2321 to joint the first primary assembling piece 231 and the second
primary assembling piece 232 to each other.

[0083] As shown in FIG. 19, FIG. 19 is a schematic view showing a joint
section of a back frame of a flat panel display device according to a
twelfth embodiment of the present invention. In another embodiment of the
back frame of flat panel display device according to the present
invention, the recesses of the joint sections 2311, 2312 of the first
primary assembling piece 231 are of a circular shape. Yet, in other
embodiments, those skilled in the art may arrange the shape of the
recesses to be other polygonal configurations, such as triangle.

[0084] As shown in FIG. 20, FIG. 20 is a schematic view showing a joint
section of a back frame of a flat panel display device according to a
thirteenth embodiment of the present invention. In another embodiment of
the back frame of flat panel display device according to the present
invention, the joint sections 2311, 2312 are recesses that do not extend
through opposite surfaces of the first primary assembling piece 231,
whereby an end of the second primary assembling piece 232 is movable
within the joint sections 2311, 2312. For example, after the end of the
second primary assembling piece 232 is set extending beyond and joined
and fixed to the joint section 2312, the portion of extension is then
trimmed off so that the length of the second primary assembling piece 232
that serves as a primary assembling piece of the back frame can be
adjusted.

[0085] In a practical application, the other end of the first primary
assembling piece 231 and both ends of the third primary assembling piece
233 are all provided with two joint sections having a structure identical
to that of the joint sections 2311, 2312. The ends of the second primary
assembling piece 232 and the ends of the fourth primary assembling piece
234 may be subjected to specific designs or no design at all according to
different applications. For example:

[0086] (1) In a first situation, as shown in FIG. 15, the two ends of the
second primary assembling piece 232 and the two ends of the fourth
primary assembling piece 234 are of no specific design. In other words,
the ends are of the same structure as the remaining portions. Under this
condition, in making a join with a selected joint section 2311 (2312) at
one end of the first primary assembling piece 231 (the same applicable to
the other end), if an attempt is made to change the width of the back
frame 23, then the length of the corresponding second primary assembling
piece 232 and fourth primary assembling piece 234 must be selected
accordingly. Namely, if the joint section 2311 that is close to the very
end of the first primary assembling piece 231 is selected for joining,
then no trimming is applied to the second primary assembling piece 232
and the fourth primary assembling piece 234 or the portion that is
trimmed off is short; if the joint section 2312 that is distant from the
very end of the first primary assembling piece 231 is selected for
joining, then the second primary assembling piece 232 and the fourth
primary assembling piece 234 are trimmed and the trimmed portion being
long or short is according to the distance that the joint section is from
the very end of the first primary assembling piece 231 being great or
small; and

[0087] (2) In a second situation, it is similar to the first situation,
but as shown in FIG. 16, the second primary assembling piece 232 and the
fourth primary assembling piece 234 use different protrusions to
respectively mate the first primary assembling piece 231 and the third
primary assembling piece 233 in order to realize change of width of the
back frame 23; similarly, if a joint section 2312 other than the first
joint section 2311 that is close to the very end of the first primary
assembling piece 231 is selected for joining, then before or after
joining, excessive portions of the second primary assembling piece 232
and the fourth primary assembling piece 234 may be trimmed off.

[0088] This also applicable to an embodiment of the main frame structure
27 of the back frame 23 that is formed by only joining two L-shaped
primary assembling pieces.

[0089] In summary, the present invention provides a back frame 23 having a
first primary assembling piece that is provided with at least two joint
sections. The number of the joint section can be selected according to
the requirement of customers. In the instant embodiment, a description is
given to an example comprising two joint sections 2311, 2312. Thus, to
prepare the molds for making the back frame 23, only two sets of mold are
needed, namely one mold for a first primary assembling piece and the
other mold for a second primary assembling piece. The first primary
assembling piece may be provided with a plurality of joint sections for
joining operation in order to form various sizes for the back frame 23.
To assemble the back frame 23, based on the desired size of the back
frame 23, the corresponding one of the joint sections is selected. With
the joint section, the second primary assembling piece is joined to the
joint section of the first primary assembling piece and the other joint
section of the first primary assembling piece that is located outward of
the joining location of the second primary assembling piece is trimmed
off to obtain a desired size of the back frame 23. Compared to the
conventional technology that requires different back frame molds for
making different sizes of back frame 10, the back frame of the flat panel
display device 23 according to the present invention requires only a mold
for the first primary assembling piece and a mold for the second primary
assembling piece 28 so that mold sharing among various sizes of product
can be realized and the molds used are of simple structures, allowing of
reduction of expenditure of the molds for back frames.

[0090] The present invention also provides a mold for making a back frame
of flat panel display device. The back frame mold is provided with a main
pattern for forming a primary assembling piece of the back frame and the
main pattern comprises a sub-pattern that forms at least two joint
sections on an end of the primary assembling piece. The primary
assembling piece comprises the previously discussed first primary
assembling piece and second primary assembling piece, corresponding to
the above mentioned main pattern; and the joint section comprises the
previously discussed joint section of the first primary assembling piece,
corresponding to the above mentioned sub-pattern. Repeated description is
omitted herein.

[0091] The present invention also provides a method for making a back
frame of flat panel display device. As shown in FIG. 21, FIG. 21 is a
flow chart showing a method for manufacturing a back frame of a flat
panel display device according to a fourteenth embodiment of the present
invention. The method comprises the following steps:

[0092] Step 501: manufacturing at least two primary assembling pieces,
wherein the at least two primary assembling pieces have joint sections
mate each other to form a foolproof structure as described in any one of
the above embodiment; and

[0093] Step 502: selecting one joint section of at least two joint
sections according to a size of the back frame to join a corresponding
end of the second primary assembling piece and using the joint section to
join the at least two primary assembling pieces.

[0094] In the instant embodiment, when other joint sections are present
between the joining location of the second primary assembling piece and
the end of the first primary assembling piece, before or after the step
of selecting one joint section of the at least two joint sections
according to a size of the back frame to join the corresponding end of
the second primary assembling piece, the other joint sections of the
first primary assembling piece that are located outward of the joining
position of the second primary assembling piece are trimmed off. The
first primary assembling piece comprises the previously discussed first
primary assembling piece, and the second primary assembling piece
comprises the previously discussed second primary assembling piece, and
repeated description will be omitted herein.

[0095] As shown in FIG. 22, FIG. 22 is a schematic view showing a flat
panel display device with a touch screen according to a fifteenth
embodiment of the present invention. The flat panel display device 20 of
the present invention further comprises a touch screen 29. The touch
screen 29 is arranged on a light exit surface of the display panel 22 of
the flat panel display device 20. The flat panel display device 20
comprises: the backlight system 21 and the above discussed display panel
22. The backlight system 21 is arranged at the back side of the display
panel 22 and supplies light to the display panel 22.

[0096] The backlight system 21 comprises a light source 25, a light
homogenization mechanism 24, and a back frame 23. The back frame 23
carries the light source 25 and the light homogenization mechanism 24.
When the backlight system 21 is an edge lighting type, the light
homogenization mechanism 24 is a light guide; and when the backlight
system 21 is a direct type, the light homogenization mechanism 24 is a
diffuser plate. The back frame 23 comprises at least a first primary
assembling piece and a second primary assembling piece, and the at least
one first and second primary assembling pieces constitute a main frame
structure 27 of the back frame 23.

[0097] Certainly, the backlight system 21 can be of the structure of any
embodiment of backlight system discussed above.

[0098] It is noted that the flat panel display device 20 of the present
invention can be a liquid crystal display device or a liquid crystal
television.

[0099] The present invention also provides a stereoscopic display device
30, as shown in FIG. 23. FIG. 23 is a schematic view showing a
stereoscopic display device according to a sixteenth embodiment of the
present invention. The stereoscopic display device 30 comprises a liquid
crystal lens grating 31, a backlight system 32, and a display panel 33.
The liquid crystal lens grating 31 is arranged on a light exit surface of
the display panel 33. The backlight system 32 can be a backlight system
of any one of the above discussed embodiments, such as the backlight
system 32 comprising the back frame 23 and a light homogenization
mechanism 24, the light homogenization mechanism 24 guiding light from
the light source to a light incidence surface of the display panel 33.
The back frame 23 comprises at least first primary assembling piece and
the second primary assembling piece. The at least first and second
primary assembling pieces form a main frame structure of the back frame.
The backlight system 32 can be of the structure of any embodiment of
backlight system discussed above. Repeated description will be omitted
herein.

[0100] The present invention also provides a plasma display device 40, as
shown in FIG. 24. FIG. 24 is a schematic view showing a plasma display
device according to a seventeenth embodiment of the present invention.
The plasma display device 40 comprises a plasma display panel 41 and a
back frame 42. The back frame 42 is arranged at a back side of the
display panel 41. The back frame 42 can be the back frame of any one of
the previously discussed embodiments and repeated description will be
omitted herein.

[0101] With the above discussed manners, the present invention provides a
flat panel display device, a stereoscopic display device, and a plasma
display device that have a mold for back frame that is of a simple
structure, reduce the cost of back frame mold, and save the material used
for the back frame, so as to lower down the cost of flat panel display
device, and joining operation is carried out with mating foolproof
structures provided on joint sections of at least two primary assembling
pieces so as to satisfy the need for foolproofing and to help an operator
to easily assembly the back frame without making mistakes, thereby
reducing operation errors and increasing efficiency.

[0102] Embodiments of the present invention have been described, but are
not intending to impose any undue constraint to the appended claims of
the present invention. Any modification of equivalent structure or
equivalent process made according to the disclosure and drawings of the
present invention, or any application thereof, directly or indirectly, to
other related fields of technique, is considered encompassed in the scope
of protection defined by the clams of the present invention.